As of 2013, little analysis of this paraphilia has been reported in medical literature. Lesbian pornography made for women is usually made by women, and usually features women who identify as lesbian or bisexual. Some BDSM practitioners prefer a code of behavior that differs from SSC and milf xxx is described as risk aware consensual kink , indicating a preference for a style in which the individual responsibility of the involved parties is emphasized more strongly, with each participant being responsible for his or her own well-being. Individuals are also sometimes abbreviated when referred to in writing, so a dominant person may be referred to as a Dom for a man, and a Domme for a woman. One or more of the participants may engage in autoerotic sexual activity, such as masturbation, possibly without physical contact with the other participants. Facial cum shots are currently regularly portrayed in pornographic lesbian hentai films and videos, often as a way to close a scene. Each participant may engage in any type of sex acts with one or both of the others, such as vaginal, anal gay movies or oral sex or mutual masturbation. Saliva pornography involves salivation and saliva. Body parts including fingers, tongue and penis may be used for anonymous oral, vaginal and/or anal intercourse. It concludes these findings suggest that an explanation for fat admiration may be that FAs are rejecting sociocultural norms of attractiveness. Facial cum shots are currently regularly portrayed in pornographic films and videos, often as a way to close a scene. The term applies to the depiction of the act rather than the act itself, and so does not include live exhibitions like sex shows and striptease. But starting with The World Biggest Gangbang , starring Annabel Chong, the pornographic industry began producing a series of films ostensibly setting gangbang records for most consecutive sex acts by one person in a short period. Usually that person prefers to stage the wetting so that his/her legs become soaked with urine.